package com.jfinal.ext.util.qrcode;

import com.google.zxing.*;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;
 /*
 生成二维码方法：
QRCodeUtil.encode(text, imgPath, destPath, true);
text：编码到二维码中的内容，这里是“我是小铭”
imgPath：要嵌入二维码的图片路径，如果不写或者为null则生成一个没有嵌入图片的纯净的二维码
destPath：生成的二维码的存放路径
true：表示将嵌入二维码的图片进行压缩，如果为“false”则表示不压缩。
解析二维码方法：
QRCodeUtil.decode(destPath);
destPath：将要解析的二维码的存放路径
  */
public class QRCodeUtil {
	private static final String CHARSET = "utf-8";
	private static final String FORMAT_NAME = "JPG";
	// 二维码尺寸
	private static final int QRCODE_SIZE = 300;
	// LOGO宽度
	private static final int WIDTH = 60;
	// LOGO高度
	private static final int HEIGHT = 60;

	 private static BufferedImage createImage(String content, String imgPath, boolean needCompress)
			 throws Exception {
		 return createImage(content, imgPath, needCompress, null);
	 }

	 private static BufferedImage createImage(String content, String imgPath, boolean needCompress, BgImage bgImg)
			 throws Exception {
		 Hashtable hints = new Hashtable();
		 hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
		 hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
		 hints.put(EncodeHintType.MARGIN, 1);
		 BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
				 hints);
		 int width = bitMatrix.getWidth();
		 int height = bitMatrix.getHeight();
		 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		 for (int x = 0; x < width; x++) {
			 for (int y = 0; y < height; y++) {
				 image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
			 }
		 }
		 if (imgPath == null || "".equals(imgPath)) {
			 return image;
		 }
		 // 插入图片
		 return QRCodeUtil.insertImage(image, imgPath, needCompress, bgImg);
	 }
 
	private static BufferedImage insertImage(BufferedImage source, String imgPath, boolean needCompress, BgImage bgImg) throws
			Exception {
		File file = new File(imgPath);
		if (!file.exists()) {
			System.err.println("" + imgPath + "   该文件不存在！");
			return null;
		}
		Image src = ImageIO.read(new File(imgPath));
		int width = src.getWidth(null);
		int height = src.getHeight(null);
		if (needCompress) { // 压缩LOGO
			if (width > WIDTH) {
				width = WIDTH;
			}
			if (height > HEIGHT) {
				height = HEIGHT;
			}
			Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
			BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
			Graphics g = tag.getGraphics();
			g.drawImage(image, 0, 0, null); // 绘制缩小后的图
			g.dispose();
			src = image;
		}
		// 插入LOGO
		Graphics2D graph = source.createGraphics();
		int x = (QRCODE_SIZE - width) / 2;
		int y = (QRCODE_SIZE - height) / 2;
		graph.drawImage(src, x, y, width, height, null);
//		Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
//		graph.setStroke(new BasicStroke(3f));
//		graph.draw(shape);
		graph.dispose();

		//插入背景图
		if(bgImg.getPath() != null && !"".equals(bgImg.getPath())) {
            if (new File(bgImg.getPath()).exists()) {
                BufferedImage bg = ImageIO.read(new File(bgImg.getPath()));
                graph = bg.createGraphics();
                graph.drawImage(source, bgImg.getX(), bgImg.getY(), bgImg.getQrWidth(), bgImg.getQrHeight(), null);
//			shape = new RoundRectangle2D.Float(bgImg.getX(), bgImg.getY(), bgImg.getQrWidth(), bgImg.getQrHeight(), 6, 6);
//			graph.setStroke(new BasicStroke(3f));
//			graph.draw(shape);
                graph.dispose();
                return bg;
            }
		}

		return source;

	}
 
	public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
		BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
		mkdirs(destPath);
		// String file = new Random().nextInt(99999999)+".jpg";
		// ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
		ImageIO.write(image, FORMAT_NAME, new File(destPath));
	}
 
	public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {
		BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
		return image;
	}

	 public static void encode(String content, String imgPath, String destPath, boolean needCompress, BgImage bg)
			 throws Exception {
		 BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress, bg);
		 mkdirs(destPath);
		 // String file = new Random().nextInt(99999999)+".jpg";
		 // ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
		 ImageIO.write(image, FORMAT_NAME, new File(destPath));
	 }
 
	public static void mkdirs(String destPath) {
		File file = new File(destPath);
		// 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
		if (!file.exists() && !file.isDirectory()) {
			file.getParentFile().mkdirs();
		}
	}
 
	public static void encode(String content, String imgPath, String destPath) throws Exception {
		QRCodeUtil.encode(content, imgPath, destPath, false);
	}
	// 被注释的方法
	/*
	 * public static void encode(String content, String destPath, boolean
	 * needCompress) throws Exception { QRCodeUtil.encode(content, null, destPath,
	 * needCompress); }
	 */
 
	public static void encode(String content, String destPath) throws Exception {
		QRCodeUtil.encode(content, null, destPath, false);
	}
 
	public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)
			throws Exception {
		BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
		ImageIO.write(image, FORMAT_NAME, output);
	}
 
	public static void encode(String content, OutputStream output) throws Exception {
		QRCodeUtil.encode(content, null, output, false);
	}
 
	public static String decode(File file) throws Exception {
		BufferedImage image;
		image = ImageIO.read(file);
		if (image == null) {
			return null;
		}
		BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
		BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
		Result result;
		Hashtable hints = new Hashtable();
		hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
		result = new MultiFormatReader().decode(bitmap, hints);
		String resultStr = result.getText();
		return resultStr;
	}
 
	public static String decode(String path) throws Exception {
		return QRCodeUtil.decode(new File(path));
	}
 
}